The right format for the job
MP3 plays on everything, from car radios to smart speakers, so it is the safe choice when you do not know where the file will be played. WAV is uncompressed and opens in every editor, DAW and old hardware, so it is best for editing and for devices that are picky about formats. M4A with AAC is compact and sounds slightly better than MP3 at the same size. OGG with Opus gives excellent quality at low bit rates, especially for speech.
Choose Mono for voice memos and podcasts recorded with one microphone: the file is half the size with no audible difference.
Private and fast
Files are decoded and encoded in your browser with its built in audio codecs, so recordings never leave your device and there is no upload wait.